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My root partition is XFS on LVM.

Before I did anything, I had two physical disks which were combined using md as /dev/md126 into a PV. That PV was the only member of a VG centos_x5backup, and there were two LVs, root and swap.

I was running out of disk space:

# df -h /
Filesystem                        Size  Used Avail Use% Mounted on
/dev/mapper/centos_x5backup-root  590G  509G   81G  86% /

I wanted more space on root. I purchased two new drives, created a md /dev/md0 combining them in raid1. That's active and resyncing:

md127 : active raid1 sda1[0] sdd1[1]
      999424 blocks super 1.2 [2/2] [UU]
      bitmap: 0/1 pages [0KB], 65536KB chunk

md0 : active raid1 sdb1[0] sdc1[1]
      1171979840 blocks super 1.2 [2/2] [UU]
      [=============>.......]  resync = 66.0% (773868928/1171979840) finish=393.1min speed=16874K/sec
      bitmap: 6/9 pages [24KB], 65536KB chunk

I added md0 as a new PV in the existing VG, and resized:

ssm resize -s+100%FREE /dev/mapper/centos_x5backup-root

I've run xfs-growfs -d /:

# xfs_growfs -d /
meta-data=/dev/mapper/centos_x5backup-root isize=512    agcount=13, agsize=36031232 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=437118976, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=70373, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data size unchanged, skipping

But after all that:

# df -h /
Filesystem                        Size  Used Avail Use% Mounted on
/dev/mapper/centos_x5backup-root  1.7T  1.6T   71G  96% /

What gives? df sees the space, but thinks its "used".

Why isn't the new space free?

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Booting from a rescue disk and running xfs_repair on /dev/mapper/centos_x5backup-root fixed the problem.

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